Oil-well-drilling drive



Feb- 17, 1931- f E; w. GoEsER f 1,79%;"9'114 OIL WELL DRILLING DRIVE originalriled Feb. 5. 1924 s sheets-sheet 1 Aw( ATTORN EY Feb. 17, 1931. E, w. GoEsER y1,792,977

OIL WELL DRILLING DRIVE.l

Original Filed Feb. 5, 1924 3 Sheets-Sheet 2 `|NVENTOR Emu/i1 W @awe/ BY ATTORNEY Feb. 17, `1931. E. w. GoEsER lv,792,977

4 OIL WELL DRILLING DRIVE Original Filed Feb. 5, 1924 3 Sheets-Sheet 5' mvENToR .Eo/wm W Gow f BY ATTORNEY Patented Feb,L 17, 1931 UNITED. STATES PATENT OFFICE EDWIN `W. GOESER, 0F LOS ANGELES, CALIFORNIA, ASSIGNOR, BY'MESNE ASSIGN- MENTS, TO EMSCO DERRICK 6c EQUIPMENT COMPANY, 0F LOS ANGELES, CALIFOR- NIA, A CGRPORATION 0F CALIFORNIA OIL-WELL-DRILLING DRIVE Continuation of application Serial No. 690,765. led February 5, 1924. This 1928. Serial No, 288,090.

My invention relates to the art of drilling oil wells, and more particularly to the art of drilling by the so-called .rotary method.

vThis application is a continuation of application, Serial No. 690,765, filed February 5, 1924:, entitled Oil-well drilling drive.

In this method a string of drill pipe is rotat-ed in the hole, carrying a bit at its lower end which is supplied with circulating water or mud through the drill pipe. In the standard arrange-ment for such drilling, the rotary table is situated at or near the center of the derrick, a square drilling stem attached to the upper end of the drill pipe projecting through this table and being driven thereby. The rotary table is driven from a draw works which is situated at one side of the derrick, and which not only drives the rotary table,

but also contains a hoisting drum by means of fhich the drill pipe may be raised 0r lowere In the standard form of draw works the mechanism is mounted on three upright beams anchored at their lower ends to the derrick base and connected at their upper ends with a horizontal girt or head board extending between two of the derrick legs. The hoisting drum is rotatably journaled between the first and second of these up# rights. Also journaled on the uprights above the drum is a driving shaft.

A sprocket is provided on the rotary table, and is driven by a chain from a sprocket situated on the driving shaft. Typical arrangements of such drives are shown in the patent to Griilin, No.1,095,157, patented April 28, 1914, and to Chapman, No. 943,913, patented December 21, 1909. In the form of rotary drive shown in these patents, which is typical of the drives now in common use throughout the oil fields, the top strand of the chain driving the rotary table extends upwardly from the rotary table at an angle of about thirty degrees. This chain is commonly covered by a guard, the chain and guard forming a sort of fence across the'rig extending about breast high of an operator from the rotary table to the draw works. These high chains are objectionable, as they cut olf the exit from the rig in case of danger,

application 1ed`June 25,

and they render the manipulation of the tongs and other tools somewhat diiiicult.

For the purpose of providing a free space entirely around the rotary table, various inventors have attempted to drive the rotary table with a shaft, a typical arrangement being shown in the reissue patent to York, No. 15,330, reissued April 4, 1922. drive, while theoretically ideal for permitting freedom of movement of oil Workers aro-und the rotary table, presents certain structural difficulties which make it undesirable for general use. The first of these is the necessity for the shaft extending from .the rotary table to pass directly under the hoistingl drum at such a level that the draw works shafts must be raised to prevent cable spooled on the drum from striking this shaft.

In aY draw works, cat-heads are mounted on opposite ends of the drive shaft. During drilling operations it frequently becomes necessary for a hoisting rope or cable to be given several turns around one of these catheads` and then for these turns to be kept taut by hand as the rope is drawn in by the cat-head. For this reason, the cat-heads have to be Within easy reach of a man' standing on the derrick floor. In the type of drawworks in general use, the eat-heads are normallyso` tion. Such a separate mounting in the average situation where derricks are set up would be exceedingly diiiicult and expensive to provide. j

It is thus seen that the shaft drive idea, though theoretically sound, is accompanied lby new problems which to date have 'not vbeen solved satisfactorily so as to make this form of rotary table drive available .for use.

It .iS an Object of my inventlon to provide The Shaft a draw works from which a rotary table may be driven without raising the draw works from' its normal position, and Without requiring bearing mounting separate from the frame of said draw works, and yet so that workers will be free to walk entirely around the rotary table iin attending totheir duties incident to drilling operations.

In drilling a well by the rotary method, the bit inthe hole frequently comes into contact with non-homogeneous strata-Which vcauses successive retarding and jumping of the bit resulting in rapid liuctuations in the torque imposed on the drill stem. These fluctuations are. of course, passed on through the rotary table to the chain between the rotary table and the drive shaft of the draw works. Owingto the necessity of placing the drive shaft above the spooling drum, considerable vibration has been transmitted to the entire derrick by the rotary table drive chain through the drive shaft and the draw works frame.y This vibration has a very destructive effect upon the draw works and the entire derrick, and no one has yet succeeded in eliminating it. Compression braces have been installed between the head board and outwardly disposed mud sills. These have absorbed the reaction on the draw works of the fluctuation in tension of the chain between the drive shaft and the engine, but have not materially reduced the vibration set up by the rotary table drive chain.

It is therefore a further object of my invention to provide a ldraw works from which a rotary table may be driven without an appreciable vibration being set up in the draw works and derrick by fluctuations in the resistance to rotation of the drill bit.

Inthe ordinary draw works the drive shaft is driven whenever the rotary machine is driven.

It is an object of my invention to provide a draw works in which the rotary machine ofthe drilling apparatus may be driven without driving the drive shaft.

`Another object is to provide a draw works in which a drive member for driving the rotary machine of the drilling apparatus is rotatably mounted on the drive shaft which drives the drum shaft.

In the standard form of draw works two sprockets are provided on the driving shaft, these sprockets driving sprockets on the drum shaft. The sprockets on the drum shaft are then alternately coupled, to the drum. In the standard form of draw works the drive shaft rotates whenever the rotary table is being operated, or whenever the drum is being operated. Owing to the peculiar arrangement used, it is therefore necessary to operate the sprockets on the drum shaft when the ro-.,

tary table is being operated and the drum is stationary.

It is a further object of my invention to provide a draw Works in which the driving shaft is operated only when the drum is beingr used, the driving shaft and its associated sprockets being stationary at the time the rotary table alone is being used.

Referring to the drawings which are for illustrative purposes only,

Fig. 1 is an elevational view showing` a drive arrangement embodying the features of my invention.

Fig. 2 is an elevational view showing that portion of my mechanism associated with the draw works of a derrick.

Fig. 3 is a plan view partially sectioned as indicated by the line 3-3 of Fig. 1.

In the drawings, I show a derrick floor 12 which provides a rigid base structure 13. Extending upward fromA this base structure is a derrick (not shown) on which is mounted a horizontal head board 14.' Ancbored at their lower ends to the base 13 are uprights 15, 16. and 17 of a draw works 18. The upper ends of these uprights are connected to vthe head board 14.

Journaled in bearings 19 and 20, attached to outer faces of the uprights 15 and 17 respectively, is a drive shaft 21. Secured on opposite ends of the shaft 2l are cat-heads 22. Rotatably mounted on the shaft 21 and journaled in a bearing 23, attached to the upright 16, is a drive member 26. Rigidly provided upon the member 26' is a sprocket 27 adapted to be rotated through a suitable sprocket chain by any suitable source of power.

Splined upon the shaft 21 and shiftable thereon by a mechanism 29, so as to lock the shaft 21 to the drive member 26, is a clutch member 30. i

Rotatable on the shaft 21 between the member 26 and the upright 17 is an upper sprocket 31 having suitable clutch faces provided thereon. Splined on the member 26 and shiftable by a mechanism 32 so as to lock the member26 to the upper sprocket 31, is a clutch 33.

Rigidly mounted on the shaft 21, for a purpose to be described later, are pinion sprockets 35 and 36.

In order to make room for a winding drum 38 to be mou/nted on the draw works 18 between the derrick floor 12 and the shaft 21, this shaft is necessarily disposed at approximately the level of the head of a man of average height. The winding drum 38 is rigidly mounted on a shaft 39 suitably journaled in bearings 40 and 41, which are attached to the inner faces of the uprights 15 and 16. Splined on the shaft 39 just inside of the uprights 15 and 16 are clutch members 43 and 44. Rotatably mounted upon the shaft 39 between the drum 38 and the clutch members 43 and 44 are sprockets 48 and 49. Suitable means are provided for manipula* ing the clutch members 43 and 44 so that both of the sprockets 48 and l49 may be left free to rotate on the shaft 39, or so that either one of these may be non-rotatably locked tothis shaft. Suitable chains, not shown, connect the sprocket with the sprocket 48, and the sprocket 36 with the sprocket 49, so that when the shaft 21 is rotated, and either of the sprockets 48 or 49 is non-rotatably locked to the shaft 39, the shaft 39 and the drum 38 will be rotated.

Rigidly mounted on the inner faces of the uprights 16 and 17, immediately above the point at which these uprights are anchored to the derrick base 13, are aligned bearings 60 and 61. Rotatably journaled in these bearings is a jack-shaft 62. Rigidly mounted upon the jack-shaft 62 between the bearings 6() and 61, are a lower driven sprocket 64 and a rotary table drive sprocket 65. The sprocket 64 is in radial alignment with the upper sprocket 31 on the drive shaft 21, and a chain 66 passes around and connects these sprockets. i

Mounted centrally in the base 13 of the derrick, is a rotary table 68 having a bevel ringgear 69. Journaled in suitable bearings on the rotary table 68 is a rotary table shaft 70 having a bevel pinion 71 meshingV with the ring-gear 69, and a driven sprocket 72. As

l will be noted in Fig. 1, the upper edge of the sprocket 72 is substantially on the same level as the upper edge of the rotary table drive sprocket 65, and in actual practice this level is approximately 18 inches above the floor 12 of the derrick.

Passing around the sprockets 65 and 72, and rotatably connecting these sprockets, is a rotary table drive chain 73. Extending longitudinally over the upper flight of the chain 73 is a guard 75, the upper edge of which is about 24 inches above the floor 12 of the derrick. One end of the guard 75 is supported by a bracket 76, and the other'end by a diagonal member 77 extending downward from the table board 14 to the derrick floor 12.

The operation of my invention is as fol-A The drive member 26 is rotated continuously by a chain connecting the sprocket 27 with a suitable source of power, such as a steam engine. p

In commencing the drilling operation, it is necessary that a drill stem, having a bit 'connected to its lower end, be assembled and extended downward through the rotary table 68 so that by rotation of the rotary table the drill stem and bit `will be rotated. The assembling and lowering of the drill stem is accomplished by means of block and tackle rigged up in the derrick, the cable of Vwhich is adapted to be wound-up on, or paid o-ut from, the'drum 38. In order to lift with this tackle, one ot' the clutchmembers '43 or be stepped over.

44 is engaged with the adjacent one of the sprockets 48 or 49, and the clutch 30 is moved by the mechanism 29 to lock the drive meniber 26 to the drive shaft 21.' 'lhis causes a rotation of the drum 38 in a manner'to spool the tackle cable. onto the drum.

lVhen the drill steril carrying the hit has been completely assembled and lowered through the rotary table 68 into the well, the upper end of the drill stem is provided with a square kelly which fits notches 78 provided in the central opening of the rotary table 68.

This rotatably connects the bit and drill stem with the rotary table so that with the rotation of the latter, the bit., resting against the b'ottom of the well, is rotated so as to deepen the well. The rotation of the'rotary table 68 is accomplished by actuating the mechanism 32 so as to move the. clutch member 33 to lock the upper sprocket 31 to the drive member 26. '.lhis'results in the rotation of the jack-shaft 62 through the chain 66 and in turn the rotation of the rotary table shaft 70 through the chain 7 3.

-Because of the :tact that much of the drilling of an oil well is done through non-homogeneous strata which often contains large boulders, the torque, imposed upon the drill stem by resistance of the bit to turning in the bottom ofl the well, iuctuates rapidly over a wide range. In the old Jform of draw works in general use previous to this invention, the rotary table was driven by a chain extending diagonally downward from a sprocket on the draw works drive shaft to the rotary table driven sprocket. As the torque imposed upon the drill stem was transmit-ted through the lower light ofthis drive chain vto the draw works at a point in the upper portion thereof where it was practically impossible to rigidly brace the draw works, the draw -works and the derrick to which it was attached were subjected constantly to a terrific vibration. Owing to the failure of all efforts, previous tothis invention, to eliminate this vibration, it had been practically accepted as inevitable, in spite ot the deterioration of the draw works and derrick resulting therefrom.

Inthe draw works of my invention, the torque of the drill stem is transmitted to the draw' worksy 18 through the lower flight of the drive chain 73, and the shaftA 63 to the uprights 16 and 17 of thedraw works at a point as close as possible to the base 13 upon which the lower ends of -these uprights are anchored. In practice, I find that This almost entirely eliminates the vibration of the draw works resulting from the iuctuations of torque in the drill stein.

Inv addition to eliminating this vibration, my invention permits the workman freedomv to move entirely around the rotary table 68, as the guard 7 5 is so low that it caneasily At the same time` the vision of the driller, standing at the left-hand end of the draw works 1S is unimpaired by high chain guards such as were formerly requiredin chain drive draw works so that in operating the draw works of my invention, the driller may constantly keep his eye on the cat-head man working at the right-hand end of the draw works, and control the draw Works so as to prevent any injury to this Workman. As previously stated, the cat-head man is subjected to the danger of being caught in the rope or cable which it is necessary for him to handle in manually removing the slack from one of .the cat-heads 22.

Another safety feature of my invention lies in the fact that when drilling is in progress over a considerable period, when it is not rcquired that the drum 38 be positively rotated, the clutch 30 may be disengaged so that the drive shaft 2l and the sprockets 48 and 49 Will not rotate. This removes any possibility of the driller or others of the workmen being injured by becoming caught be tween these sprockets and the chain connecting them with thesprockets 35 and 3G on the shaft 21.

It Will thus be seen that I have accomplished the objects of my invention in a pe culiarly simple and effective manner which has heretofore been entirely overlooked by inventors in this art. Thilo I have shown but a single embodiment of my invention, it is to be understood that various modifications and changes could be made in the structure shown without departing from the spirit of the invention as above set forth, and as indicated in the appended claims.

I claim as my invention:

1. In an oil well 'drilling apparatus, the combination of: a rotary table; a winding drum; a driving sha ft; a member turning` freely on said driving Ishaft; means by which said member is driven from a suitable prime mover; means for driving said rotary table; means for driving said Winding drum; means for detachably coupling said member directly to said means for driving said rotary table; and ,means for detachably couplin(T said member to said means for driving said winding drum independently of the last named means.

2. In an oil well drilling apparatus, the combination of: a rotary table; a Winding drum; a driving shaft; a member turning freely on said driving shaft; means by Which said member is driven from a suitable prime mover; means for driving said rotary table.; means for driving said winding drum from said driving shaft; means for detachably Iioupling said member directly to said means for driving said rotary table; and means for detachably coupling said member to said driving shaft independently of said' last named means.

3. In an oil Well drillingapparatus, the combination of: a rotary table; a Winding drum; a driving shaft; a member turning freely on said driving shaft; means by which said member is driven from a suitable prime mover; a jacleshaft; means by Which said rotary table is driven from said jack-shaft; means for driving said Winding drum from said driving shaft; means by which said jackshaft is driven; means for coupling said member directly With said means by which said jack-shaft is dri-ven; and means for detachably coupling said member to said means for driving said winding drum independently of said last named coupling means.

4. In an oil well drilling apparatus, the combination of: a rotary table; a Winding drum; a driving shaft; a member turning freely on said driving shaft; means by which said member is driven from a suitable prime mover: a jack-shaft; a sprocket free to turn on said driving shaft; means by Which said sprocket drives said jack-shaft; means by which said jacl-shaft drives said rotary table; and means by which said member can be detachably coupled to said sprocket on said driving shaft.

5. Inan oil Well drilling apparatus, the combination of: a driving shaft forming a portion of a draw Works; a rotary table; a jack-shaft; a driving member operable by a prime mover and parallel with Said jack shaft; means for establishing a driving connection from said driving member to said jack-shaft: means for establishing an independent driving connection from said driving member to said driving shaft and adapted tobe disconnected from said driving shaft to permit rotation of said jack-shaft While the driving shaft remains stationary; and means by vvhich said jack shaft drives said rotary table.

G. In an oil Well drilling apparatus, the combination of: a driving shaft forming a portion of a draw Works; a rotary table; a jack-shaft mounted in parallel relationship with said driving shaft; a driving member operable by a prime mover; means for establishing a driving connection from said driving member to said jack-shaft; means for establishing a driving connection from said driving member to said driving shaft and adapted to be disconnected from said driving shaft to permitrotation of said jack-shaft While the driving shaft remains stationary; and means by Which said jack-shaft drives said rotary table.

7. In an oil Well drilling apparatus, the combination of: a driving shaft forming a portion of a draw Works; a rotary table; a jack shaft; a driving member operable by a prime mover; means for establishing a driving connection from said driving member to said ack-shaft; means for establishing an independent driving connection from said driving member to said driving shaft and adapted to be disconnected from said driving shaft to permit rotation of said jackshaft While the driving shaft remains stationary; and chain and sprocket means by which said jack-shaft ydrives said rotary table.

8. In an oil well drilling apparatus, the combination of: a driving shaft forming a portion of a draw works; a rotary table; a jack-shaft m'ounted close to the floor of the derrick and in parallel relationship with said driving shaft; a driving member operable by a prime mover; means for establishing a driving connection from said driving member to said jack-shaft; means for establishing a driving connection from said driving member to said driving shaft andadapted to be disconnected from said driving shaft to permit rotation of said jack-shaft while the driving shaft Vremains stationary; and chain and sprocket means byy which said jack-shaft drives said rotary'table, the upper strand of said chain bein close to and substantially parallel to said oor of the derrick at such a height that it can be readily stepped over by an operator. Y

9. A draw works comprising: a drive shaft; a drum shaft mounted below and substantially parallel to said drive shaft; a drum carried by said drum shaft; means for driving said drive shaft; means connected to said drive shaft and said drum shaft for' driving said drum shaft; a jack-shaft mounted below andparallel to said drive shaft and in such a position as to rest close to a derrick floor; means carried by said drive shaft and connected to said jack-shaft for driving said j ack-shaft; and a vsprocket mounted on said jack-shaft in a position to be connected to a rotary machine by azsprocket'chain.

10. A draw. works comprising: a drive shaft; a drum shaft mounted below and substantially parallel to said drive shaft; a drum carried by said drum shaft; means connected to said drive shaft and said drum shaft for driving said drum shaft; a jack-shaft mounted below and parallel'to said @drive shaft and in such a position as to rest close to a derrick floor; a drive member carried by said drive shaft; means for. selectively causing said drive member to drive said jack-shaft; and a sprocket mounted on said jack-shaft, in a position to be connected to a rotary machine by a sprocket chain.

11. A draw works comprising: a drive shaft; adrum shaft mounted below and sub-4 stantially parallel to said drive shaft; a drum carried by said drum shaft; means for driving said drive shaft; means connected tosaid drive shaft and said drum shaft for driving said drum shaft; a jack-shaft mounted in a lowerl plane than said drum shaft and parallel thereto, said jack-shaft extending horizontally beyond one end of said drum shaft and in such a position as to rest close to a derrick floor; means carried by said drive shaft and connected to said j ack-shaft for driving said jack-shaft; and a sprocket mounted on said j ack-shaft, in a position to be connected to a rotary machine by a sprocket chain.

12. A draw works comprising: a drive shaft; a drum shaft mounted below and substantially parallel to said drive shaft; a drum carried by said drum shaft; means connected to said drive shaft and said drum shaft for driving said drum shaft; aj ack-shaft mounted in a lower plane than said drum shaft and parallel thereto, said jack-shaft extending horizontally beyond one end of said drum shaft and in such aposition as to rest close to a derrick floor; a drive member carried by said drive shaft; means for selectively causing said drive member .to drive said drive shaft; means for selectively causing said drive member to drive said ack-shaft; and a sprocket mounted on said jack-shaft, in a position to be connected to a rotary machine by a sprocket chain.

13. In combination: a derrick having a 'base structure; a plurality of draw works uprights anchored at their lower ends to said base structure and connected at their upper ends to said derrick; a winding drum rotatlably mountedon certain of said uprights; a

drive member rotatably mounted on certain of said uprights above said drum; a jackshaft rotatably mounted on certain of said uprights adjacent to the anchor base thereof; a sprocket on said jack-shaft adaptedto be connected through a drive chain to a rotary table for rotating the latter; and means for rotating said winding drum and said jackshaft by said drive member.

14. In a rotary drilling apparatus, the combination of z a mainframe structurewincluding a derrick having a base, and a pluralityof drawworks uprights anchored at their lower ends to said base and connected at their upper ends to said derrick; a rotary table mounted centrally upon said base and having va drive sprocket; a winding drum rotatably mounted on certain of said uprights; a drive member rotatably mounted on` certain of Said uprights above said drum; a jack-shaft disposed parallel with said drive member and rotatably mounted on said structure adjacent the juncture of said uprights with the derrick base; a sprocket on said jack-shaft; a sprocket chain connecting said jack-shaft sprocket to said rotary table sprocket; and means for rotating said winding drum and said j ack-shaft by said drivemember.

15. In combination: a derrick having -ay drum rotatably mounted on the inner one and on an outer one of said uprights; a drive member rotatably mounted on certain of said uprights above said drum; a jack-shaft rotatably mounted on said inner, one and the other outer one of said uprights adjacent the anchor base thereof; a sprocket on said jack-shaft adapted to be connected through a drive chain to a rotary table for rotating the latter; and means for rotating said winding drum and said jack-shaft by said drive member.

1G. In combination: a derrick having a floor; a rotary machine near the center of said derrick Hoor, said rotary machine hav ing a sprocket; a draw works at one side of said derrick Hoor, said draw works including primary, secondary and tertiary uprights; a drive member rotatably carried by at least one of said uprights; a drum shaft carried by said primary and secondary uprights parallel to and below said drive mem ber; a drum on said drum shaft; means connected to said drum .shaft and said drive member through which said drum shaft is driven; an upper sprocket positioned between said secondary and tertiary uprights adjacent to said drive member; a clutch for drivably connecting said drive member and said upper sprocket; a jack-shaft carried by said secondary and tertiary uprights close to said derrick oor and parallel to said member; a lower sprocket secured to said jackshaft; a sprocket chain drivably connecting said upper and lower sprockets together; a drive sprocket secured on said jack-shaft; and a sprocket chain drivably connecting said sprocket of said rotary machine and said drive sprocket, said last-named sprocket chain being close to said floor at both ends so that workmen may easily step over same.

17. In combination: a derrick having a floor; a rot-ary machine near the center of said derrick floor, said rotary machine having a sprocket; a draw works at. one side of said derrick ioor; said draw works including a pair of uprights; a member carried by at least one of said uprights; said member being adapted to be rotatably driven; an upper sprocket located between said uprights adjacent to said member; clutch means for drivably connecting said member and upper sprocket; a jack-shaft supported by said uprights. said jack-shaft being close to said derrick floor and being parallel to said member; a lower sprocket mounted on said ackshaft between said uprights; a sprocket chain drivably connecting said upper and lower sprockets together; a drive sprocket secured on said ack-shaft; and a sprocket chain drivably connecting said sprocket of said rotary machine and said drive sprocket, said lastnamed .sprocket chain being close to said floor at both ends so that workmen may easily step over same.

18. In a rotary drilling apparatus, the combination of a main frame structure including a derrick having a heavy base; and a plurality of draw works uprights disposed in a row along one side of said base and anchored at their lower ends to said base and connected at their upper ends to said derrick; a rotary table rigidly mounted centrally upon v said base and having a drive sprocket; a jacknha't't disposed parallel with the draw works side of said base and rotatably mounted on said structure adjacent the juncture of said nprights with the derrick base, a drive shaft and drinn .sha l't mounted in said frame; above and adjacent to said jack-shaft, a sprocket on said jack-shaft; a sprocket chain connecting said jack-shaft sprocket to said rotary table sprocket; means for rotating said jack-shaft so as to drive said rotary table, means for operating said drive shaft from a prime mover,

and means opcrably connecting the drive.

shaft and the drum shaft.

19. In an oil well drilling apparatus, the combination of: a derrick having a floor; a rotary machine supported near the center of said derrick fioor, said rotary machine having a driven sprocket; a draw worksl frame supported at one side of said derrick' a drive shaft supported by said draw works frame; a drum shaft carried by said draw works frame; means for drivably connecting said drive shaft and said drum shaft; al drum on said drum shaft; a drive member rotatably surrounding said drive shaft; means whereby said drive member may be driven; a drive sprocket rotatable on said drive shaft; means for drivably connecting said drive sprocket and said drive member; and means for drivably connecting said drive sprocket and said driven sprocket independently of said last named means.

20. In an oil well drilling apparatus, the combination of: a derrick having a floor; a rotary machine supported near the center of said derrick floor, said rotary machine having a driven sprocket; a draw works frame supported at one side of said derrick; a drive shaft supported by said draw works frame; a drum shaft carried by said draw works frame; means for drivably connecting said drive shaft and said drum shaft; means for driving said drive shaft; a drum on said drum shaft; a drive member rotatably surroundin g said drive shaft; means whereby said drive member may be driven; .a drive sprocket rotatable on said drive shaft; means for drivably connecting said drive sprocket and said drive member; and means for drivably connecting said drive sprocket-and saiddriven sprocket independently of said last named means.

21. In an oil well drilling apparatus, the combination of: a derrick having a floor; a rotary machine supported near the center of said. floor, said rotary machine having a itil) ini:

llo

- a jack-shaft,

driven sprocket; a draw works mounted at one side of said derrick floor, said draw Works comprising a frame having a` plurality of uprights, a drive shaft rotatably` supported by said uprights, a drive member surrounding lsaid drive shaft and' rotatable n thereon, a drive member driving-sprocket carried by said drive member and adapted to be connected with a source of power; a drive sprocket surrounding said drive shaft and rotatable with respect to said shaft and said drive member, and a clutch for drivably connecting said drive member and said drive sprocket; and means for drivably connecting said drive Sprocket and said driven sprocket.

22. In an oil well drilling apparatus, the combination of: a rotary table; a Winding drum; a driving shaft; a driving member operated from a suitable prime mover, and adapted to drive Said driving shaft; means for driving the rotary table; means for driving the winding drum; means for detachably coupling said member directly to said means for driving the rotary table, and additional means for detachably coupling said members to the means for driving the winding drum. Y

23. The combination described in claim 22, in which the meansfor driving the winding drum is mounted on the driving shaft.

24. In an oil well drilling apparatus the combination of la rotary table; a winding drum; a driving shaft; means for operating said winding drum from said driving shaft, means for. driving the rotary table from the said jack-shaft, a driving member operated from a suitable prime mover, means for detachably coupling the member directly with the jack-shaft, and means for detachably coupling the member to the driving shaft.

25. In an oil well drilling apparatus, the

combination of: amember directly operated from aprime mover, a` winding' drums-'detachably connected to said member, a rotary table, a jack-shaft having ya driving connection with the rotary table, and means detachably connected with said member and cooperating with the jack-shaft to actuate thev latter directly from said member.

26. In an oil Welll drilling apparatus, the combination of: a drive shaft, a rotary table, a driving member rotatable on said drive shaft, a jack-shaft below and parallel'with the drive shaft, meansifor driving the rotary table vfrom the jack-shaft, means for establishing a driving connection from said driving memberto the jack-shaft, means for esta l ishing a driving connection from said ture, a driving shaft mounted in said frame, a drum shaft mounted in said frame below the driving shaft and parallel therewith, a jack-shaft mounted in said frame below the driving and drum shafts in ofset relation to the drum shaft, and parallel to the driving shaft, said jack-shaft being positioned substantially at the lower end of the draw Works frame, a rotary table at the other end of the 4base structure, and operative connectionsgbetween the drive shaft and drum shaft, and between the jack-shaft and rotary, and means for actuating both the drive shaft and jackv shaft.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 19th day of June, 1928.

EDWIN W. GOESER.

driving member to the drive shaft, and means Y for independently controlling the last named means while the jack-shaft is rotating.

27. In combination, a derrick having a base structure, a draw works frame anchored at its lower end to one side of the base struc- 

